Is there a reliable kilobyte counter?

[Politis]

I am reaching the limit of my broadband allowance, which is 40GB a month. I have no idea why I used so much. Perhaps my downloads for my new Macbook Pro?

1/ Is there a reliable 'kilobyte-counter? How can I monitor how many kilobytes I am using from the internet?
2/ I have been looking for a chart that breaks down, or estimates how many kilobytes are used by different webpages. Not a happy hunt.
3/ I cannot find on my Macbook Pro a list of all my applications, programs,etc and their size. Any ideas?

 

[Hellhammer]

1. iStat can monitor how much data you have downloaded and uploaded.

3. E.g. OmniDiskSweeper shows files ranked by their size

 

[orfeas0]

3. E.g. OmniDiskSweeper shows files ranked by their size

there's also DaisyDisk, it presents your files as a pie diagram but it's a paid program, so you may become an outlaw (torrentz!). I really like DaisyDisk. you should try it.